It starts with a letter from an old friend inviting you to dinner. How can something so simple, so innocent, throw you into a dark world of murder, mystery, and the supernatural? Set in London in 1603, this enormous Lovecraftian interactive fiction adventure will challenge and immerse you in a world that feels real and dangerous. Available as a free download or as an enhanced edition for Kindle devices and Nook tablets, this 12 to 15 hour adventure is a challenge, but one well worth undertaking.

Verge is a puzzle platformer originally developed by Kyle Pulver (maker of Depict1) for a TIGSource game competition, and now ported to flash by Kristian Macanga. Its tone can best be described with the HP Lovecraft quote that was the game's inspiration: Life and Death - Death-its desolation and horror-bleak spaces-sea-bottom-dead cities. But Life-the greater horror! Vast unheard-of reptiles and leviathans-hideous beasts of prehistoric jungle-rank slimy vegetation-evil instincts of primal man-Life is more horrible than death. The twin opposing horrors of life and death is a haunting, challenging concept, and thus it should be no surprise that it makes for a haunting, challenging game... one where death and rebirth is the only way to progress.

We've all been there... Friday night, just hanging out at your house at R'lyeh waiting, dreaming, for your cult leader servant to finally complete the ritual that will grant you unlimited power. But then, all these lame-o cops, Miskatonic professors, mystics, and asylum escapees just had to show up and try to ruin your fun. Good thing your very tentacley touch brings the corrupted servitude of madness. Still, you'd think they'd just learn to Leave Cthulhu Alone! In this flashpunk tower defense game from Loserville Express, messing with the old ones has never been so much fun!

Based on an H.P. Lovecraft story, Mystery Stories: Mountains of Madness is a casual adventure game set in the snowy hills of Antarctica. As if pulling a tale from Lovecraft wasn't interesting enough, the team at Cerasus Media went on to create an adventure game fused with intricate puzzles and alluring locations that beg your cursor to go searching for every item and every object it can click on. It's a quietly impressive game that walks a different path than most casual adventure/hidden object games, making it a fantastic experience from beginning to end.

Much interactive fiction requires a time commitment of an hour or two, and sometimes quite a bit more. Not so with the text adventure entries in the Commonplace Book project, in which each entrant took a line from a notebook by H. P. Lovecraft and spun it out into a game. This was an international competition, drawing entries in English, French, and Spanish, as well as a couple of graphical point-and-click adventures.

Deanimator is an elegantly simple, gorgeous and gruesome shooter that was inspired by one of H. P. Lovecraft's short stories, Herbert West: Reanimator, which is the gruesome tale of an eccentric young doctor with a penchant for experiments that involve reanimating the dead. If you have the stomach for survival horror, don't miss this one.